Apps for sharing, managing business card info on phones

Apologies if this overlaps some previous topics, but either my search-fu is weak or the Ars boards could use an advanced search feature.

Does anyone use apps on their phones for dealing with business cards? Inputing info from a card you've been handed, sharing yours or someone else's, searching or exporting the data, acting on the data, etc.? Bump, Salesforce, or any other apps?

If so, what apps do you use, when, and how? What is or isn't working for you?

I use evernote. Just scan it in or take a photo with your phone, and evernote does automatic ocr in the background. You can just search for John Doe, your note with the embedded business card photo will show up, and his name will be highlighted on the photo itself. I don't share business card info, but if you did (to say, co-workers), evernote has shared notebooks.